NEUROPTERA. 



417 



[eiving food. The larvae have, at the end of their bodies, two long 

 ireads, which remain in the perfect Ferla, but not in the perfect 



Fig. 387. — Perla bicaudata. 



-Nemoura variegata 



Fig. 389.— Nemoura variegata (larva\ 



Vemoura ; the latter lose the two caudal hairs when they arrive at 

 le adult state. One species of Perla is very common on the quays 

 f Paris. 



The Ephemeridce, or May-Fly family, have long, slender bodies, 



B B 



